Of Hollow Bodies (e.g., Pipe, Sphere, Etc.) Patents (Class 148/570)
  • Patent number: 11148736
    Abstract: A bushing assembly for a track assembly includes a first end element, a second end element, and a central element positioned between the first end element and the second end element. The central element may be interference fit or positioned between the first end element and the second end element, and the central element may include a greater hardness than the first and second end elements. The first end element, the second end element, and the central element form a bushing with a longitudinal opening extending longitudinally through the bushing.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: October 19, 2021
    Assignee: Caterpillar Inc.
    Inventors: Eric J. Johannsen, Chandrasen R. Rathod, Scott Keele, Jason L. Sebright, Roger L. Recker, Arthur Bland, Douglas Trent Weaver, Thomas J. Yaniak
  • Patent number: 11072360
    Abstract: A method can be employed to produce a rack for a steering gear. The rack may include a toothed portion with a toothing, and a shaft portion with a functional portion. Separate segments comprising at least one in each case bar-shaped toothed segment and one shaft segment may be provided, which are aligned on a common longitudinal axis and are connected to one another at a joint. The method may involve providing a shaft raw material piece having a length that is a multiple of a shaft segment length, continuously grinding a part of a circumferential face of the shaft raw material piece across a multiple of the shaft segment length to produce a semi-finished shaft segment product, cutting to length a shaft segment from the semi-finished shaft segment product, providing a toothed segment, and joining the shaft segment to the toothed segment.
    Type: Grant
    Filed: July 4, 2017
    Date of Patent: July 27, 2021
    Assignees: THYSSENKRUPP PRESTA AG, THYSSENKRUPP AG
    Inventors: Reinhard Bader, Ralf Eckstein, Roland Musweiler
  • Patent number: 11046618
    Abstract: A ceramic matrix composite (CMC) is formed by infiltrating a metal or alloy into a fiber preform in a reactor or furnace that is separated into multiple discrete temperature zones. The gradual cooling of the CMC is controlled, such that upon solidification, a narrow, planar, solidification front is created which allows the expanding metal or alloy to move into a hotter section of the fiber preform, opposed to the surface of the CMC. A discrete solidification front is established that moves through the ceramic matrix composite (CMC) as the composite cools.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: June 29, 2021
    Assignees: ROLLS-ROYCE CORPORATION, ROLLS-ROYCE HIGH TEMPERATURE COMPOSITES INC.
    Inventors: Robert Shinavski, Joseph Doyle, Andrew Ritchey, Stephen Harris
  • Patent number: 10961599
    Abstract: A steel composition, a reinforcement part of a vehicle using the steel composition and a method of manufacturing the reinforcement part using the steel composition are provided. In particular, the steel composition includes increased content of carbon components and the steel composition is processed by rapid heating and immediate quenching.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: March 30, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Alex Khutorsky, Jonghyun Kim
  • Patent number: 10837069
    Abstract: A device for generating a microstructure with a structure gradient in an axisymmetric mechanical part having a hollow center and initially possessing a uniform structure with fine grains, the device including a first heater system defining a first shell for receiving the mechanical part and suitable for heating the outer periphery of the mechanical part to a first temperature higher than the solvus temperature. The device further includes a second heater system defining a second shell arranged inside the first shell and suitable for heating the inner periphery of the mechanical part to a second temperature lower than the solvus temperature, with the space between the first shell and the second shell defining a housing suitable for receiving the axisymmetric mechanical part having a hollow center.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: November 17, 2020
    Assignee: SAFRAN
    Inventors: Jean-Michel Patrick Maurice Franchet, Gilles Charles Casimir Klein
  • Patent number: 10704584
    Abstract: A process for joining fiber composite materials using self-piercing rivets. The process includes contacting first and second panels. The second panel is a fiber composite material. The process further includes elevating a temperature of only a fastening portion of the second panel. The process also includes placing the first and second panels on a die and joining the first and second panels with one or more rivets while the fastening portion is at an elevated temperature.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: July 7, 2020
    Assignee: Ford Global Technologies, LLC
    Inventors: Aindrea McKelvey Campbell, Garret Sankey Huff, Amanda Kay Freis
  • Patent number: 10688552
    Abstract: Provided herein is a method of hot gas forming and heat treatment for a Ti2AlNb-based alloy hollow thin-walled component, which pertains to the technical field of plastic forming manufacture of thin-walled components made from difficult-to-deformation materials, more particularly, a forming method of Ti2AlNb-based alloy hollow thin-walled components is involved. The purpose of this invention is to solve the existing problems that Ti2AlNb-based alloy hollow thin-walled components are difficult to form, process steps are complex, and the shape and dimension precision is in contradiction with the control of the microstructure and properties. The method comprises the following steps: (1) hot gas forming to obtain hot gas formed tube components, and (2) controllable-cooling heat treatment to obtain Ti2AlNb-based alloy hollow thin-walled components.
    Type: Grant
    Filed: May 8, 2018
    Date of Patent: June 23, 2020
    Assignee: HARBIN INSTITUTE OF TECHNOLOGY
    Inventors: Gang Liu, Shijian Yuan, Dongjun Wang
  • Patent number: 10646912
    Abstract: A forming apparatus that forms a metal pipe includes: a heating unit which heats a metal pipe material; a gas supply unit which supplies gas into a heated metal pipe material, thereby expanding the metal pipe material; a die which forms the metal pipe by bringing the expanded metal pipe material into contact with the die; a cooling unit which cools the metal pipe after the forming by a cooling medium; and a control unit which controls an operation of the die, the gas supply unit, and the cooling unit, wherein the control unit makes cooling of the metal pipe by the cooling medium be performed, by controlling an operation of the die such that the die is opened and controlling the cooling unit such that the cooling unit brings the cooling medium into contact with the metal pipe, subsequently to completion of forming by the die.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: May 12, 2020
    Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.
    Inventors: Masayuki Ishizuka, Norieda Ueno, Masayuki Saika, Takashi Komatsu
  • Patent number: 10487373
    Abstract: A steel pipe for line pipe has a composition of, in mass %: C: 0.02 to 0.11%; Si: 0.05 to 1.0%; Mn: 0.30 to 2.5%; P: up to 0.030%; S: up to 0.006%; Cr: 0.05 to 0.36%; Mo: 0.02 to 0.33%; V: 0.02 to 0.20%; Ti: 0.001 to 0.010%; Al: 0.001 to 0.100%; N: up to 0.008%; Ca: 0.0005 to 0.0040%; and other elements and satisfies Cr+Mo+V?0.40, the chemical symbols in the equation substituted by the content of the corresponding element in mass %. The pipe contains tempered martensite and/or tempered bainite and further contains ferrite in at least one of a portion between a steel pipe outer surface and a depth of 1 mm from the outer surface, and a portion between a steel pipe inner surface and a depth of 1 mm from the inner surface.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: November 26, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Taro Oe, Keiichi Kondo, Hiroki Kamitani, Yuji Arai
  • Patent number: 10384310
    Abstract: An induction heating coil includes a coil section configured to heat a treatment target by induction, a power supply section configured to supply power to the coil section, and a cooling medium passage that is arranged in the power supply section and the coil section, and is configured to supply a cooling medium to the coil section. The coil section, the power supply section, and the cooling medium passage are formed using a metal additive fabrication method.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: August 20, 2019
    Assignee: Koyo Thermo Systems Co., Ltd.
    Inventors: Ryosuke Yamamoto, Ayaka Nakata, Norihide Fujiyama
  • Patent number: 10376990
    Abstract: An induction heating coil includes a coil section configured to heat a treatment target by induction, a power supply section configured to supply power to the coil section, and a cooling medium passage that is arranged in the power supply section and the coil section, and is configured to supply a cooling medium to the coil section. The coil section, the power supply section, and the cooling medium passage are formed using a metal additive fabrication method.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: August 13, 2019
    Assignee: Koyo Thermo Systems Co., Ltd.
    Inventors: Ryosuke Yamamoto, Ayaka Nakata, Norihide Fujiyama
  • Patent number: 10124389
    Abstract: A traverse strut for use in a twist beam axle assembly is provided. The traverse strut extends along a length and presents a central section; a pair of end sections; and a pair of intermediate sections between the central section and the respective end sections. At least a portion of the central section has a first wall thickness, at least a portion of each end section has a second wall thickness that is greater than the first wall thickness and at least a portion of each intermediate section has a third wall thickness that is greater than the second wall thickness. Additionally, at least two of the central, intermediate and end sections is work hardened. The transverse strut has improved performance and lower weight as compared to other known transverse struts.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: November 13, 2018
    Assignee: Magna International Inc.
    Inventors: Andreas Stranz, Edward William Schleichert
  • Patent number: 10100391
    Abstract: A size hardening heat treatment process for steel parts of a plate, cylindrical or spherical shape and using low or specified hardenability steel compositions which are through surface heated and very rapidly quenched to produce case hardening of the part. A set of graphs are provided which depict the relationship between the depth of hardening and the dimension of the part for each of a series of critical, i.e., ideal diameter values which allow producing a depth of hardening of a particular part by a proper selection of the DI value of the part. The DI values are calculated by a formula which allows a range of DI values to be created by varying the components of the steel as set out in the formula. The formula also insures a fine grain size to be created by the process to prevent cracking by the very rapid quenching required. A list of elements allowed in the steel but limited by a % mass set out for each component.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: October 16, 2018
    Inventors: Anatoly Alexeevich Kuznetsov, Arkady Moissevich Peker, Alexey Alexandrovich Kupriyanov, Sergey Ivanovich Nikitin
  • Patent number: 9580765
    Abstract: A deformation correcting device to correct a deformation occurring in a ring shaped article, which has been heated, while the heated ring shaped article is cooled, includes a support table, on which the ring shaped article in a heated condition is placed; a pair of receiving rolls; a press roll provided in opposition to the pair of the receiving rolls with the ring shaped article intervening therebetween; a press roll drive mechanism for driving the press roll between an advanced position, at which the press roll is urged against the outer peripheral surface of the ring shaped article, and a retracted position, at which the press roll is separated away from the outer peripheral surface of the ring shaped article; and a press roll rotating mechanism for rotating the press roll then urged against the ring shaped article by the press roll drive mechanism.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: February 28, 2017
    Assignee: NTN CORPORATION
    Inventor: Kunio Kamo
  • Patent number: 9303297
    Abstract: The present invention relates to a method for heat treatment of a columnar work. In order to provide the method for heat treatment of a columnar work being able to attain a high productivity, a reduction of cost, and an improvement of quality, as compared with the prior art, the method for heat treatment of a columnar work of the present invention includes a quench-hardening step (S1) and a tempering step (S2) being carried out after the quench-hardening step (S1), the quench-hardening step (S1) includes a first quench-hardening step (S11) and a second quench-hardening step (S12) being carried out after the first quench-hardening step (S11), the entire region of the columnar work (3) from an outer circumferential surface (31f) to a core thereof (32), or a partial region thereof, is heated up to a temperature not lower than a transformation temperature Ac3, and then, the work is quench-hardened.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: April 5, 2016
    Assignee: TOPY KOGYO KABUSHIKI KAISHA
    Inventor: Weidong Xue
  • Patent number: 9248490
    Abstract: In a method of making a tubular structural part for a motor vehicle, a metal plate is contoured and preformed in at least one shaping step into a tubular body. Subsequently, the tubular body is end-formed into the structural part by internal high-pressure application while free contact regions snugly bear upon one another. The structural part is at least partially heated and quenched in a holding tool acted upon with a coolant.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: February 2, 2016
    Assignee: BENTELER AUTOMOBILTECHNIK GMBH
    Inventors: Holger Diersmann, Hans-Jürgen Knaup, Rafael Garcia Gómez
  • Patent number: 9005379
    Abstract: The present invention relates to a process for producing a pipe, particularly for supplying fuel to an engine, comprising the steps of: prearranging a pipe made of stainless steel (1), executing a hot-pressing operation at at least one end (3) of the pipe (1); and subjecting the at least one end (3) of the pipe (1) to heat treatment, followed by cooling.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: April 14, 2015
    Assignee: Chesini Meccanica S.R.L.
    Inventor: Natale Chesini
  • Publication number: 20150068650
    Abstract: A production method of a metal pipe which can suppress quenching defects is provided. In the production method of a metal pipe according an embodiment of the present invention bend of the metal pipe is straightened by a straightening machine 10. Next, both pipe end portions of the metal pipe whose bend has been straightened are cut off by a pipe cutting apparatus 20. Next, a plurality of the metal pipes whose both pipe end portions have been cut off are aligned in the axial direction thereof to be conveyed to a quenching apparatus 30, and the metal pipes are quenched by being cooled after being heated by induction heating.
    Type: Application
    Filed: February 22, 2013
    Publication date: March 12, 2015
    Inventors: Shunichi Otsuka, Kazuhiro Uchida, Takuya Hanada, Masami Sakiyama, Tsutomu Shima
  • Patent number: 8974613
    Abstract: A method of quenching a ring shaped article includes heating the article to a quenching temperature; primarily cooling the article down to a deformation correction initiating temperature, which is higher than a martensitic transformation point; and secondarily cooling the article down to a temperature lower than the martensitic transformation point by, while a pair of receiving rolls are held in contact with an outer peripheral surface of the article for rolling motion about an axis of rotation parallel to a center of the article, pressing a press roll, rotatable about an axis of rotation parallel to the center of the article, against the outer peripheral surface of the article from one side of the article opposite to a point intermediate between the receiving rolls.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: March 10, 2015
    Assignee: NTN Corporation
    Inventor: Kunio Kamo
  • Patent number: 8895906
    Abstract: A magnetic flux concentrator is used to control the end heating of a tubular material in an electric induction heat treatment process. The magnetic flux concentrator may consist of fixed elements, or a combination of fixed and moveable elements to accommodate end heating of tubular materials having different dimensions or material properties.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: November 25, 2014
    Assignee: Inductoheat, Inc.
    Inventors: Don L. Loveless, Peter A. Ross, Valery I. Rudnev, John Paul Lang
  • Publication number: 20140305552
    Abstract: A method for heat-treating a ring-shaped member includes the steps of: forming, by relatively rotating an coil along the circumferential direction of the formed body, an annular heated region in the formed body, the heated region having the steel austenitized therein; and simultaneously cooling a whole of the heated region to a temperature of not more than an Ms point. In the step of forming the heated region, the heating is performed to repeatedly change over for a plurality of times between a state in which each region of the rolling contact surface has a temperature exceeding a temperature of an A1 point and a state in which each region of the rolling contact surface has a temperature that is less than the temperature of the A1 point and that maintains a supercooled austenite state.
    Type: Application
    Filed: October 16, 2012
    Publication date: October 16, 2014
    Applicant: NTN CORPORATION
    Inventor: Chikara Ohki
  • Patent number: 8845830
    Abstract: A steel pipe with a wall thickness over 30 mm is subjected to heat treatment of quenching and tempering using a temperature range of at least not less than 750° C. during the heating stage, makes it possible to obtain a heavy-wall seamless steel pipe having excellent toughness by resulting grain refinement. Quenching is by performing water cooling after heating the steel pipe to a temperature in the range of not less than 900° C. to not more than 1000° C. by using, as a heating means, induction heating at a frequency of not more than 200 Hz. Tempering is performed at a temperature in the range of not less than 500° C. to not more than 750° C. Preferably, after the heating by induction heating, a soaking treatment is performed in the temperature range of not less than 900° C. to not more than 1000° C. for 10 minutes or less followed by water cooling.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: September 30, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Kunio Kondo, Yuji Arai
  • Patent number: 8795450
    Abstract: There is provided a steel pipe for fuel injection pipe that assures prolonged fatigue life and high reliability by securing a high critical internal pressure, at which fatigue fracture does not occur, while the material strength is high. A steel pipe for fuel injection pipe consisting of, by mass percent, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, and Mn: 0.8 to 2.0%, the balance being Fe and impurities, the impurities containing Ca: 0.001% or less, P: 0.02% or less, and S: 0.01% or less, wherein the tensile strength thereof is not lower than 900 N/mm2, and the maximum diameter of a nonmetallic inclusion present during at least 20 ?m depth from the inner surface of the steel pipe is not larger than 20 ?m. Further, this steel pipe can contain one or more kinds of Cr: 1% or less, Mo: 1% or less, Ti: 0.04% or less, Nb: 0.04% or less, and V: 0.1% or less.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: August 5, 2014
    Assignees: Usui Kokusai Sangyo Kaisha, Sumitomo Metal Industries, Ltd.
    Inventors: Shoichiro Usui, Katsunori Nagao
  • Publication number: 20140212082
    Abstract: A rolling-element bearing includes an inner ring made of steel and having an inner-ring raceway, an outer ring having an outer ring raceway, and ceramic rolling elements which roll on the inner-ring raceway and on the outer-ring raceway. The inner ring has been subjected to a heat treatment to harden it. The heat treatment is concluded with the performance of a final heat-treatment step at a predetermined temperature. In the inner ring, compressive residual stresses are formed in an outer layer by cold working in the region of the inner-ring raceway. The inner ring also has been subjected to a bluing treatment.
    Type: Application
    Filed: January 28, 2014
    Publication date: July 31, 2014
    Applicant: Aktiebolaget SKF
    Inventors: Juergen Gegner, Wolfgang Nierlich, Armin Herbert Emil August Olschewski, Arno Stubenrauch
  • Publication number: 20140137992
    Abstract: A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the Vickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less.
    Type: Application
    Filed: June 29, 2012
    Publication date: May 22, 2014
    Applicant: JFE Steel Corporation
    Inventors: Yasuhide Ishiguro, Mitsuo Kimura, Kenichiro Eguchi, Hiroshi Yokogawa, Tadao Katagiri, Masahito Tanaka
  • Patent number: 8728386
    Abstract: A method and apparatus for annealing cylindrical cases for ammunition cartridges or other tubular casings is provided. In one embodiment, a case annealing apparatus is provided. The case annealing apparatus includes a base, a feeding device having a first end tapering to a second end that is coupled to the base, a rotatable feed wheel assembly disposed adjacent a second end of the feeding device, a linear slide mechanism disposed adjacent the rotatable feed wheel assembly defining a portion of a case receiving region, and a heating device disposed adjacent the case receiving region, the heating device operable to heat a portion of a case retained in the case receiving region.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: May 20, 2014
    Assignee: Giraud Tool Company, Inc.
    Inventors: Douglas Hilton Giraud, David Bland Alden
  • Publication number: 20130301969
    Abstract: A method for producing a bearing ring of a rolling bearing includes the steps of: preparing a formed body constituted of hypereutectoid steel; forming an annular heated region heated to a temperature of at least an A1 point on the formed body by relatively rotating an induction heating member arranged to face part of an annular region for becoming a rolling contact surface of the bearing ring in the formed body to induction-heat the formed body along the circumferential direction of the annular region; and simultaneously cooling the whole of the heated region to a temperature of not more than an Ms point.
    Type: Application
    Filed: January 12, 2012
    Publication date: November 14, 2013
    Applicant: NTN CORPORATION
    Inventors: Hiroshi Yuki, Chikara Ohki, Kazuhiro Yagita
  • Patent number: 8529711
    Abstract: An induction heat treatment method with which temperature control is enabled, condition setting is easy, and the quality of a treatment object can be stabilized includes: a data acquiring step of heating and quench-hardening a sample of the treatment object to thereby acquire process data; a storing step of storing the process data; a checking step of checking the power supply output transition data and the quenching timing data as to validity based on the temperature transition data stored in the storing step; and a mass production step of performing heat treatment of the treatment object in accordance with the power supply output transition data and the quenching timing data stored in the storing step and checked as to validity in the checking step.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: September 10, 2013
    Assignee: NTN Corporation
    Inventors: Takumi Fujita, Nobuyuki Suzuki
  • Publication number: 20130044852
    Abstract: A treatment of a heater tube intended to be used in a pressurizer of the primary cooling system of a nuclear reactor. In particular, the heater tube comprises a heater housed in a substantially cylindrical sheath. The material of which this sheath is made is a work-hardened austenitic stainless steel. In particular, the external surface of the sheath is liable to undergo a stress corrosion during use of the heatertube. The method includes a heat treatment step, preferably using induction heating, in which the external surface of the sheath is heat-treated so as to recrystallize the material of the sheath at least on the surface thereof.
    Type: Application
    Filed: April 6, 2011
    Publication date: February 21, 2013
    Applicant: ELECTRICITE DE FRANCE
    Inventors: Jacques Champredonde, Jean-Marie Fageon, Yves Neau
  • Patent number: 8323560
    Abstract: Disclosed is a high-strength electric resistance welded steel pipe which is manufacture from a steel sheet containing, on mass basis, 0.2% to 0.4% C, 0.05% to 0.5% Si, 0.5% to 2.5% Mn, 0.025% or less P, 0.01% or less S, 0.01% to 0.15% or Al, 0.01% to 2% Cu, 0.05% to 2% Cr, 0.005% to 0.2% Ti, and 0.0002% to 0.005% B, with the remainder being iron and inevitable impurities. The steel pipe has a tensile strength of 1750 N/mm2 or more, a 0.1%-proof stress of 1320 N/mm2 or more, and a Charpy impact value at a testing temperature of minus 40° C. of 50 J/cm2 or more.
    Type: Grant
    Filed: February 25, 2008
    Date of Patent: December 4, 2012
    Assignee: Kobe Steel, Ltd.
    Inventors: Motoo Satou, Yukihiro Utsumi, Kenichi Watanabe
  • Patent number: 8273195
    Abstract: A heat treatment method of heat-treating a steel tube provides the steel tube with satisfactory workability and high pressure resistance capable of coping with a recent increasing trend of pressure dealt with by a recent common rail type fuel injection system. A steel tube of a desired size is formed by drawing a material of a steel containing at least vanadium. The steel tube is processed for normalizing by holding the steel tube at high temperatures between 950 and 1000° C. for a predetermined time and slowly cooling the steel tube at a predetermined cooling rate. Then, the steel tube is processed for tempering by heating the steel tube at a temperature between 500 and 700° C. and cooling the steel tube to an ordinary temperature at an optional cooling rate.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: September 25, 2012
    Assignee: Sanoh Kogyo Kabushiki Kaisha
    Inventors: Hideki Toyoshima, Yukari Nakazawa
  • Publication number: 20120118441
    Abstract: A steel pipe with a wall thickness over 30 mm is subjected to heat treatment of quenching and tempering using a temperature range of at least not less than 750° C. during the heating stage, makes it possible to obtain a heavy-wall seamless steel pipe having excellent toughness by resulting grain refinement. Quenching is by performing water cooling after heating the steel pipe to a temperature in the range of not less than 900° C. to not more than 1000° C. by using, as a heating means, induction heating at a frequency of not more than 200 Hz. Tempering is performed at a temperature in the range of not less than 500° C. to not more than 750° C. Preferably, after the heating by induction heating, a soaking treatment is performed in the temperature range of not less than 900° C. to not more than 1000° C. for 10 minutes or less followed by water cooling.
    Type: Application
    Filed: January 20, 2012
    Publication date: May 17, 2012
    Applicant: SUMITOMO METAL INDUSTRIES, LTD.
    Inventors: Kunio KONDO, Yuji Arai
  • Patent number: 8101031
    Abstract: A hollow shaft material is provided with, on an outer peripheral surface side thereof, for example, a movable induction heating coil wrapped therearound. While a high-frequency current with a predetermined frequency is caused to flow through the induction heating coil, the induction heating coil is axially moved to perform induction hardening of the hollow shaft material from the outer peripheral surface side. At this moment, the frequency of the high-frequency current caused to flow through the induction heating coil is set relatively low as to the small-diameter portions, which have a relatively small thickness, and the frequency of the high-frequency current caused to flow through the induction heating coil is set relatively high as to the large-diameter portion, which has a relatively small thickness.
    Type: Grant
    Filed: July 21, 2005
    Date of Patent: January 24, 2012
    Assignee: NTN Corporation
    Inventors: Katsuhiro Sakurai, Toru Nakagawa, Masamichi Shinbo, Masami Yamaguchi, Tsuneaki Hiraoka
  • Patent number: 8034201
    Abstract: The present invention provides a method for induction hardening of a steel member having an outer ring portion and, more specifically, for induction hardening of an outer circumferential surface of the outer ring portion. The method uses two pressing members, each of which includes a flat basal surface and a projecting portion projecting therefrom. Each of the projecting portions has a cross-section in the shape of a perfect circle. Also, the projecting portions have, on the outer circumferences thereof, respective pressing surfaces. While gaps are maintained between axial end faces of the outer ring portion and the basal surfaces of the pressing members, the pressing members are pressed against the outer ring portion so that the pressing surfaces each abut against the inner circumference side of the outer ring portion. While a biasing force is applied to the pressing members, the induction hardening process is applied to the outer circumferential surface.
    Type: Grant
    Filed: October 21, 2005
    Date of Patent: October 11, 2011
    Assignee: AISIN AW Co., Ltd.
    Inventors: Kouji Ohbayashi, Kazuaki Okada
  • Publication number: 20100230014
    Abstract: A method of quenching a ring shaped article includes a heating step (S1) of heating the article (W) to a quenching temperature; a primary cooling step (S2) of cooling the article (W) down to a deformation correction initiating temperature, which is higher than a martensitic transformation point; and a secondary cooling step (S3) of cooling the article (W) down to a temperature lower than the martensitic transformation point by, while a pair of receiving rolls (3) are held in contact with an outer peripheral surface of the article (W) for rolling motion about an axis of rotation parallel to a center of the article (W), pressing a press roll (4), rotatable about an axis of rotation parallel to the center of the article (W), against the outer peripheral surface of the article (W) from one side of the article (W) opposite to a point intermediate between the receiving rolls (3).
    Type: Application
    Filed: September 24, 2008
    Publication date: September 16, 2010
    Applicant: NTN CORPORATION
    Inventor: Kunio Kamo
  • Patent number: 7776160
    Abstract: An apparatus (10) includes a low-carbon steel tube (24). The low-carbon steel tube (24) yields plastically more than about 5% before fracturing at temperatures down to about ?40° C. when stress is applied to the low-carbon steel tube sufficient to cause the low carbon steel tube to so yield.
    Type: Grant
    Filed: December 3, 2003
    Date of Patent: August 17, 2010
    Assignees: TRW Automotive U.S. LLC, Sumitomo Metal Industries Ltd.
    Inventor: Eric C. Erike
  • Patent number: 7727463
    Abstract: A high strength steel pipe for an airbag system has a steel composition comprising C: 0.05-0.20%, Si: 0.1-1.0%, P: at most 0.025%, S: at most 0.010%, Cr: 0.05-1.0%, Al: at most 0.10%, at least one of Ti and Mn satisfying (1) Ti?0.02% and (2) 0.4%?Mn+40Ti?1.2%, and a remainder of Fe. The composition may further include one or more of (i) at least one of Mo: 0.05-0.50%, Ni: 0.05-1.5%, V: 0.01-0.2%, and B: 0.0003-0.005%, (ii) at least one of Cu: 0.05-0.5% and Nb: 0.003-0.1%, and (iii) at least one of Ca: 0.0003-0.01%, Mg: 0.0003-0.01%, and REM: 0.0003-0.01%. The steel pipe can be manufactured by forming a pipe from the above-described steel composition to obtain prescribed dimensions, heating to at least the Ac1 transformation point and quenching, and then tempering at the Ac1 transformation point or below.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: June 1, 2010
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yuji Arai, Kunio Kondo
  • Patent number: 7694532
    Abstract: A system and method is provided for tempering a glass container. The method includes the steps of pre-heating the glass container to a first predetermined temperature. The method also includes the steps of applying radio-frequency energy to the pre-heated glass container to heat the glass container to a second predetermined temperature and, after a predetermined amount of time, simultaneously cooling at least one surface of the heated glass container to a third predetermined temperature to treat the glass container. The method further includes the steps of, after a predetermined amount of time, quenching the treated glass container to a fourth predetermined temperature to produce a tempered glass container.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: April 13, 2010
    Inventor: Premakaran T. Boaz
  • Patent number: 7645964
    Abstract: A high frequency heat treatment method for a fine bottom-closed hole includes preparing a coil so as to be completely inserted into the fine bottom-closed hole, preparing a core for controlling a magnetic flux within the coil such that the core protrudes from upper and lower sides of the coil, heat-treating a target part of the fine bottom-closed hole under conditions of a heating time of 2˜3 seconds, an output power of 200˜300 kW, a quenching time of 3˜5 seconds, a positive electrode voltage of 4 ˜8 kV, and a positive electrode current of 2.0˜4.5 A, and quenching the heat-treated part of the fine bottom-closed hole with cooling nozzles fixed around the heat-treated part such that a sufficient amount of cooling water is injected uniformly over the whole heated part with a sufficient pressure via the cooling nozzles.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: January 12, 2010
    Assignee: Korea Sintered Metal Co., Ltd.
    Inventors: Jong Kwan Park, Young Su Jeon
  • Patent number: 7638005
    Abstract: Quenched layers are formed without irregularities on the inner circumferential surface of a track bushing having a small inside diameter or on the inner circumferential surfaces of two or more track bushings which are subjected to quenching in an overlapped condition. To introduce a cooling medium for cooling the inner circumferential surface of the track bushing, a guide tube having an outside diameter smaller than the inside diameter of the track bushing is disposed on the side of the inner circumferential surface and the cooling medium introduced by the guide tube is diverted by a diverting member having a spherical or similar curved surface, such that the cooling medium is allowed to flow in a direction substantially parallel with an axial direction of the track bushing 1 within a space defined by the outer circumferential surface of the guide tube and the inner circumferential surface of the track bushing, thereby performing laminar flow cooling.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: December 29, 2009
    Assignee: Komatsu, Ltd.
    Inventors: Takemori Takayama, Chigo Okayama, Masayuki Ohishi, Takeyo Terao
  • Publication number: 20090308502
    Abstract: The present invention relates to a process for producing a pipe, particularly for supplying fuel to an engine, comprising the steps of: prearranging a pipe made of stainless steel (1), executing a hot-pressing operation at at least one end (3) of the pipe (1); and subjecting the at least one end (3) of the pipe (1) to heat treatment, followed by cooling.
    Type: Application
    Filed: June 10, 2009
    Publication date: December 17, 2009
    Inventor: Natale CHESINI
  • Publication number: 20090252904
    Abstract: A method for the production of mechanically highly stressed machinery components, with at least one pass-through opening, especially suction roll sleeves on paper machines, includes the material characteristics of the machinery component being altered with regard to an increase in the resistance against vibratory fissure corrosion on the machinery component in the localized area of the pass-through opening. A roll sleeve produced according to this method is also provided.
    Type: Application
    Filed: April 7, 2009
    Publication date: October 8, 2009
    Inventors: Herbert Weinberger, Florian Hochreiter
  • Patent number: 7591912
    Abstract: An induction heat treatment method with which temperature control is enabled, condition setting is easy, and the quality of a treatment object can be stabilized includes: a data acquiring step of heating and quench-hardening a sample of the treatment object to thereby acquire process data; a storing step of storing the process data; a checking step of checking the power supply output transition data and the quenching timing data as to validity based on the temperature transition data stored in the storing step; and a mass production step of performing heat treatment of the treatment object in accordance with the power supply output transition data and the quenching timing data stored in the storing step and checked as to validity in the checking step.
    Type: Grant
    Filed: March 21, 2006
    Date of Patent: September 22, 2009
    Assignee: NTN Corporation
    Inventors: Takumi Fujita, Nobuyuki Suzuki
  • Patent number: 7563335
    Abstract: A method of forming a dual chamber seamless tube (64) includes providing a slug of steel (56) and cold working a first end (70) of the slug (56) to form a first chamber (114) and cold working a second end (72) of the slug (56) to form a second chamber (116). The first and second chambers (114 and 116) are axially aligned and separated by a wall portion (126) of the tube (64).
    Type: Grant
    Filed: November 7, 2005
    Date of Patent: July 21, 2009
    Assignee: TRW Vehicle Safety Systems Inc.
    Inventor: Eric C. Erike
  • Patent number: 7559251
    Abstract: Disclosed is an apparatus and method for forming thermal fatigue cracks in a test piece for performance demonstration of nondestructive testing. The apparatus for forming thermal fatigue cracks includes a heating unit, having a conductive member attached around the outer surface of a pipe test piece and an induction heating coil disposed adjacent to the conductive member; a cooling unit, having a cooling water pump for forcibly supplying cooling water to the inner surface of the pipe test piece from a cooling water storage source and a cooling water hose; and a control unit for controlling operation of the heating unit and the cooling unit. Accordingly, thermal fatigue cracks similar to actual thermal fatigue cracks occurring during the operation of nuclear power plants or processing industry equipment are formed in a test piece, thereby assuring effective performance demonstration of nondestructive testing.
    Type: Grant
    Filed: January 22, 2007
    Date of Patent: July 14, 2009
    Inventors: Bo-Young Lee, Duck Hee Ryu, Jae Seong Kim, Yong Kim, Dae Hwan An
  • Publication number: 20090110589
    Abstract: A steel material of 85 to 95 HRB exhibiting a ratio of area occupied by ferrite of 30% or higher, which steel material comprises given amounts of C, Si, Mn, S, Ti, Cr, Al and B and the balance of iron and unavoidable impurities, is subjected to induction hardening. After the hardening, the surface of the steel material exhibits an Hv value of 640 to 730. When t refers to the effective hardening depth, namely, the distance from the surface to a region exhibiting an Hv value of 392 and r refers to the radius of the steel material, the hardened layer ratio, t/r, is 0.4 or higher.
    Type: Application
    Filed: October 11, 2006
    Publication date: April 30, 2009
    Inventors: Yoshimi Usui, Yutaka Sato, Masahiko Igarashi, Wataru Yanagita, Hideo Watanabe, Satoru Nakamyo
  • Publication number: 20090101246
    Abstract: The present invention provides a method for induction hardening of a steel member having an outer ring portion and, more specifically, for induction hardening of an outer circumferential surface of the outer ring portion. The method uses two pressing members, each of which includes a flat basal surface and a projecting portion projecting therefrom. Each of the projecting portions has a cross-section in the shape of a perfect circle. Also, the projecting portions have, on the outer circumferences thereof, respective pressing surfaces. While gaps are maintained between axial end faces of the outer ring portion and the basal surfaces of the pressing members, the pressing members are pressed against the outer ring portion so that the pressing surfaces each abut against the inner circumference side of the outer ring portion. While a biasing force is applied to the pressing members, the induction hardening process is applied to the outer circumferential surface.
    Type: Application
    Filed: October 21, 2005
    Publication date: April 23, 2009
    Applicant: AISIN AW CO., LTD.
    Inventors: Kouji Ohbayashi, Kazuaki Okada
  • Publication number: 20090082117
    Abstract: Provided is a method of manufacturing a hollow power transmission shaft, which makes it possible to ensure stable quality even when there is a difference in wall thickness or hardening ratio along an axial direction thereof. A hollow shaft material (1?) is provided with, on an outer peripheral surface (1g) side thereof, for example, a movable induction heating coil (5) wrapped therearound. While a high-frequency current with a predetermined frequency is caused to flow through the induction heating coil (5), the induction heating coil (5) is axially moved to perform induction hardening of the hollow shaft material (1?) from the outer peripheral surface (1g) side.
    Type: Application
    Filed: July 21, 2005
    Publication date: March 26, 2009
    Inventors: Katsuhiro Sakurai, Toru Nakagawa, Masamichi Shinbo, Masami Yamaguchi, Tsuneaki Hiraoka
  • Publication number: 20090032149
    Abstract: A heat treatment method of heat-treating a steel tube provides the steel tube with satisfactory workability and high pressure resistance capable of coping with a recent increasing trend of pressure dealt with by a recent common rail type fuel injection system. A steel tube of a desired size is formed by drawing a material of a steel containing at least vanadium. The steel tube is processed for normalizing by holding the steel tube at high temperatures between 950 and 1000° C. for a predetermined time and slowly cooling the steel tube at a predetermined cooling rate. Then, the steel tube is processed for tempering by heating the steel tube at a temperature between 500 and 700° C. and cooling the steel tube to an ordinary temperature at an optional cooling rate.
    Type: Application
    Filed: July 26, 2006
    Publication date: February 5, 2009
    Inventors: Hideki Toyoshima, Yukari Nakazawa
  • Publication number: 20090000708
    Abstract: A method for manufacturing a complex heat treated tubular structure includes making a tube assembly having tube portions along its length of differing characteristic. The tube assembly is formed by lengthwise tube bending and hydroforming to provide a desired shape. The tube is formed by lengthwise tube bending and hydroforming to provide a desired shape. The tube is supported in a locating fixture having a plurality of supports spaced along the tube to support the tube against distortion. A local region of the tube is heated in at least one local region to a temperature to heat treat the local region. A quenching medium is then flushed through the hollow interior of the tube, and the tube is removed from the locating fixture..
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Wuhua Yang, Charles J. Bruggemann